Testing modules

[bajtos]

Create tooling for testing Zinnia modules in an automated way.

• Unit-testing & integration testing.
• Both JavaScript and Rust/WASM.
• Documentation for module authors.

Tasks:

• Automated tests for JS modules #44
• Automated tests for Rust modules - depends on Modules built using Rust/WASM [ON DEMAND] #74

[juliangruber]

Is there a standard we want to adapt? Maybe deno's testing stdlib?

[bajtos]

Yes, adopting a widely used standard would be best! ✌️

I'd like to start with why & how we want to test. There can be a different testing strategy & tooling for unit-testing pure functions that don't depend on Zinnia platform APIs vs integration-level testing of functions that invoke Zinnia APIs.